Note 5 - Fair Value Measurements (Details Textual) - Asuragen and Redpath [Member] - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016
Business Combination, Contingent Cash Consideration, Deferred Payments		$ 4.6
Business Combination, Contingent Cash Consideration, Revenue Based Payments	$ (0.3)	13.9
Business Combination Contingent Cash Consideration Deferred Payments, Net Increase (Decrease) in Fair Value		0.4
Business Combination Contingent Cash Consideration Deferred Payments, Increase (Decrease) in Fair Value		$ 0.7